body,html{
	width:100%;
	height: 100%;
}
#demo{
	float:right;
	width:calc(100% - 220px);
}
.first-menu-li{
	font-size:16px;
}
.second-menu-li{
	font-size:14px;
	margin-left: 20px;
}
.menu-tree input{
	vertical-align: middle;
	margin-right: 10px;
}
.menu-tree .first-menu-checkbox{
	vertical-align: middle;
	margin-right: 15px;
	float:left;
	margin-top: 9px;
}
.action-area{
	float:left;
}
.menu-tree span{
	vertical-align: middle;
}
.symbol{
	font-size: 20px;
	margin-left:10px;
}
.arrow{
	vertical-align: middle;
	margin-right: 5px;
}
.arrow-rotate{
	transform: rotate(90deg);
}